📄 find_if.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>find_if</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">C++ Algorithms</a> > <a href= "find_if.html">find_if</a> </div> <div class="name-format"> find_if </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <algorithm> iterator find_if( iterator start, iterator end, UnPred up );</pre> <p>The find_if() function searches for the first element between <em>start</em> and <em>end</em> for which the unary predicate <em>up</em> returns true.</p> <p>If such an element is found, an iterator pointing to that element is returned. Otherwise, an iterator pointing to <em>end</em> is returned.</p> <p>For example, the following code uses find_if() and a "greater-than-zero" unary predicate to the first positive, non-zero number in a list of numbers:</p> <pre class="example-code"> int nums[] = { 0, -1, -2, -3, -4, 342, -5 }; int* result; int start = 0; int end = 7; result = find_if( nums + start, nums + end, bind2nd(greater<int>(), 0)); if( *result == nums[end] ) { cout << "Did not find any number greater than zero" << endl; } else { cout << "Found a positive non-zero number: " << *result << endl; } </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="adjacent_find.html">adjacent_find</a><br> <a href="equal.html">equal</a><br> <a href="find.html">find</a><br> <a href="find_end.html">find_end</a><br> <a href="find_first_of.html">find_first_of</a><br> <a href="search_n.html">search_n</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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